Dart GUI widget

 https://www.dartlang.org/docs/tutorials/web-ui/


 https://www.dartlang.org/articles/web-ui/

http://dart-lang.github.io/widget.dart/


 Although ploymer is going to replace web ui, but there seems no widget library provided for ploymer...

 http://www.infoq.com/news/2013/07/dart-polymer-web-ui

http://www.infoq.com/news/2013/05/webcomponents